Introduction RxJava with retrolambda on android studio

1. RxJava with retrolambda
introduction
Andyang@2015/12/26

2. RxJava (x)
RxJava (o)

3. lifecycle memory leak
callback hell
error handling
lambda

4. API
XD

5. Retrolambda
Android N Java8
retrolambda library support lambda
jdk8
support java6/7
android support java8
gradle

6. retrolambda setting on
android studio
apply plugin: 'me.tatarka.retrolambda'
buildscript {
repositories {
mavenCentral()
}
dependencies {
classpath 'me.tatarka:gradle-retrolambda:3.2.4'
}
}
compileOptions {
sourceCompatibility JavaVersion.VERSION_1_8
targetCompatibility JavaVersion.VERSION_1_8
}

7. lambda#1
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
System.out.println("click")
}
});
// lambda
button.setOnClickListener(view -> System.out.println("click"));

8. lambda#2
input -> body
view -> System.out.println("click")

9. lambda#3
intput
void
() -> body
x -> System.out.println(x)
(x, y) -> x + y;
(int x, int y) -> x + y;

10. lambda#4
() -> {}
{}
(x, y) -> x + y;
(x, y) -> x + y

11. lambda#5
(x, y) ->{
x * x;
y * y;
}
(x, y) ->{
x * x;
y * y;
return x + y;
}

12. lambda#6
Object reference
view.setOnClickListener(v -> v.setVisibility(View.GONE));
view.setOnClickListener(this::viewGone);
private void viewGone(View v){
v.setVisibility(View.GONE);
}

13. RxJava
pub/sub

14. RxJava setting on
android studio
RxAnroid
compile ‘io.reactivex:rxandroid:1.1.0'
RxLifecycle
compile 'com.trello:rxlifecycle:0.4.0'
compile 'com.trello:rxlifecycle-components:
0.4.0'

15. AsyncTask
class MyTask extends AsyncTask<String, Integer, String>
{
@Override
protected String doInBackground(String... params) {
return null;
}
@Override
protected void onPostExecute(String s) {
super.onPostExecute(s);
}
}

16. RxJava
//Observable
api.getPets()
//Scheduler
.subscribeOn(Schedulers.newThread())
.observeOn(AndroidSchedulers.mainThread())
//Observer
.subscribe();

17. Observable
Observable.create(subscriber -> {
subscriber.onNext("");
subscriber.onCompleted();
subscriber.onError(null);
});

18. api.getPets()
.compose(bindToLifecycle())
.map(petsResponse ->
petsResponse.getResult().getResults())
.retry(this::networkRetry)
.subscribeOn(Schedulers.newThread())
.observeOn(AndroidSchedulers.mainThread())
.finallyDo(dialog::dismiss)
.subscribe(adapter::setPets, this::showErrorLog,
this::onComplete);
private boolean networkRetry(int times, Throwable throwable)
{
RetrofitError retrofitError = (RetrofitError) throwable;
return retrofitError.getKind() ==
RetrofitError.Kind.NETWORK || times < 3;
}

19. DEMO
4 sample

20. Sample 1 : api
DEMO

21. Sample 2 :
DEMO

22. Sample 3:
DEMO

23. Sample 4:
DEMO

24. sample code
1.https://github.com/bng86/RxJavaWithRetrolambdaSample
1.https://www.youtube.com/watch?v=k3D0cWyNno4
2.https://github.com/kaushikgopal/RxJava-Android-
Samples
3.https://mcxiaoke.gitbooks.io/rxdocs/content/Intro.html

25. Q&A